tblough wrote: ↑Wed May 15, 2024 10:59 am
After all best practices have been employed (twisted pair shielded wire, proper grounds, bypass caps, etc.), you might want to look into a signal isolator:
This product did not work. It requires 24V input, says on the sticker but not the listing. Hooked it up and no bueno. Also tried a second product which was a dud as well. Running out of ideas.
It is a signal isolator, so it does require independent power input to work. You supply 24VDC power along with your 0-10V signal, and you get an isolated 0-10V signal out.
If it "didn't work", at this point, after everything else you have tried, I'd suspect something seriously wrong with your drive.
Cheers,
Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
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Considered this unit however running off 110-240 would be a problem for me as it would bring AC close to my low voltage DC connections. I was able to find a unit on amazon that worked for me. More testing to come.
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spikee wrote: ↑Thu May 16, 2024 8:14 am
I'm not well versed in centroid. But does not have some kind of compensation so you can just calibrate whatever offset or error out?
Yes, DMM does have drive tuning software but due of the non-linearity of the distortion any wide-band adjustments are not helpful.
Last edited by Measurement10 on Thu May 16, 2024 4:51 pm, edited 2 times in total.
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tblough wrote: ↑Thu May 16, 2024 4:23 pm
It is a signal isolator, so it does require independent power input to work. You supply 24VDC power along with your 0-10V signal, and you get an isolated 0-10V signal out.
I couldnt get it to work. Followed the directions on the side and it was outputing an unexpected voltage, tried adjusting pots with no luck. I may look at it again but the second unit i purchased is working now. See https://www.amazon.ca/Isolation-S-10V10 ... B07RGWJC26.
Only trouble with this one is you must be careful of the wiring, the guidelines are not clear. You only connect the 0-10v+ and not both +/- to this device. I left a review clarifying the correct procedure, hopefully it can help others as i almost returned it.
So far it works well on its own, i will try hooking it up to the DYN4 tomorrow, fingers crossed.
Last edited by Measurement10 on Thu May 16, 2024 6:22 pm, edited 1 time in total.
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cnckeith wrote: ↑Thu May 16, 2024 6:10 pm
i think others have tired with the DYN4 as spindle motor and gave up and went with other solutions that have been proven to work.
Does Centroid publish a list of these proven components?
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this forum is a place for users to share their experience and information searching that info would be a good place to start your research before buying a component and going all lone ranger.
this "dyn4 as spindle motor" comes up about every six months or so, i personally don't know anyone that got it working. i think marty tired for weeks on it and he has a lot of patience and was working direct with DMM.
others here on the forum have gotten AC servos to work very well as spindle motors and have shared that info.
both Uwe and Gary shared info on what they did. this is where i would start. I think gary used a Leashine AC drive.
Centroid puts A LOT of effort into curating drives, VFD's and other components to help the DIY CNC community as can been seen in our software, hookup schematics, and tech bulletins. that being said i do not have a "here is how you do it for model such and such" set of instructions for "AC Servo as spindle motor".
Gary says "I use LeadShine EM motors with ELP drives to drive the spindles on small wood lathes that I produce. I use them in both velocity (-10-0-10 volt) mode AND step and direction mode, switched by an input."
looks like you read this one! https://centroidcncforum.com/viewtopic. ... 129#p62129
where gary says I tried using DMM a few years back, but like most here the results were not good and I got tired of sending them in for firmware upgrades. Kudos to the guys that get them to work, but I will stick with my Leadshines.
Uwe says
I use JMC servos in speed mode for the spindle 0-10V for the speed and one Acorn output to change direction through a input on the servo drive.
Works perfect for rigid tapping.
Should also work to switch the servo from speed to position mode and use a Acorn header to drive the servo as C-axis. Will try this out on the lathe I am building.